My roomate and I used to borrow tampons from the girls next door and have tampon fights.

We stuck one on their door and left our door open so we could hear what people said when they saw it.

Some security guards walked up the stairs and I swear one of them said, "Looks like we got some devil worshippers on this floor." The other guard said, "Nope. It looks like a tampon stuck to the door."